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truss rod

It will certainly fight back before it breaks. If it's fighting back, STOP!

Also when tightening the truss rod, I like to loosen the strings and put the bass on the ground between my legs holding the body with my feet and use my knee as a fulcrum while pushing on the headstock. This will allow you to tighten the trussrod without the trussrod doing the actual work.
 
If you're nervous about it, loosen it by a quarter-turn first. That will give you a feel for how much friction you should feel. When you tighten it back up a bit, if you feel considerably more tension that that, stop.
 
If it squeaks, stop. That is the same sound (different pitch) that tightening a lug nut makes when changing a tire. If that sound is unfamiliar, it might be best to take the instrument to a professional and ask them to do it while you watch.
 
If this is your first time doing it, I would back the nut completely out and lubricate it with some graphite. Lock cylinder lubricant works very well.

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